Midnight Depths

You all touch down on the alien mountain, being the first humans ever to do so. Myers spots Sissay's ARC and footsteps leading inside a cavern.

It looks like some colonists fled down here, but you only find Sissay, with the same coral from the ship growing out of him. He attacks Peter, who turns feral as well, and Myers is forced to shoot them back. Amelia's data is mangled, but before you can escape, more colonists appear behind you. And they don't seem like themselves...

Inside the cavern is a pit filled with buildings eerily similiar to the ones on the colony. You all shimmy across the ledge, but find the walls have xeno-lifeforms wounded with coral coming out of them, blocking off your path. Ellie sees a cave ahead that might allow you to escape.

The cave has crystals showing rebirth, and you discover that VR1-ICA has been infected all along with the coral. She reveals that the coral is not the main infection vector. Ellie seems to be deteriorating too, but she points to a new cave that has the symbol for light.

Ellie realises that it is not the coral at all, but the signal, the symbols, that make her want to stay here and become part of it. But she still has the wherewithal to try and escape, lest you all fall to it.

Amelia tries to bargain with the mountain, offering you all up as sacrifice, and promising to transmit the signal further for it. But Ellie saves you by pushing Amelia off the ledge, and going down with her. Myers is hit by Amelia's gun, but it's only a flesh wound.

Myers and you manage to escape the mountain as the only survivors. You get into the ARC, and Myers promises VR1-ICA that she will stop her before she can transmit the signal back to earth.